There remains much debate over the merits (and demerits) of lithium ion batteries as a viable power source for hybrids. Honda, a company often associated with being on the cutting edge of technology, is not so sure about lithium ion batteries, at least not just yet. Their upcoming Prius-fighter is likely to use proven battery technology, that is until lithium ion batteries have proven themselves.
Here's Green Car Advisor's take: Despite Competition, Honda Not Sold on Lithium Ion
Also, here's another related story on Honda's above-mentioned Prius-fighter, as a few details are now beginning to emerge...
ateixeira says:
08:13 AM, 03/31/08
Subaru's R1e electric uses Li-ion batteries. Given Toyota owns a share of FHI, maybe they will transfer some of that knowledge and experience to an HSD model.
They're already in use, though.
billt9 says:
10:19 PM, 04/ 1/08
...in use by 10 tester cars.